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Re: i need help with my 328i
A good air filter, definitely. But if you just spend some time to maintain it well, such as oil change, tranny fluid, differential fluid, spark plugs. It will be quick enough already. Because I own a 325, it gets slower everytime there's something that's not maintained well. So I rather think how to keep its original power without losing it, than thinking how to make it faster without keeping it in good shape. So I would say "if you're tight in budget, just spend money to maintain the car well" You won't regret.
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